Ch. 8 Review
Which reaction does not occur? A. 2HF(aq) + Cl2(g) --> F2(g) + 2HCl(aq) B. 2Na(s) + ZnF2(aq) --> 2NaF(aq) + Zn(s) C. Fe(s) + CuCl2(aq) --> FeCl2(aq) + Cu(s) D. 2HCl(aq) + Mg(s) --> MgCl2(aq) + H2(g)
A. 2HF(aq) + Cl2(g) --> F2(g) + 2HCl(aq)
Predict the product of the reaction represented by the following equation: MgO + CO 2 --> A. MgCO3 B. Mg + CO3 C. MgC + O3 D. MgCO2 + O
A. MgCO3
The formulas for the products of the reaction between sodium hydroxide and sulfuric acid are... A. Na2SO4 and H2O B. NaSO4 and H2O C. SI4 and Na2O D. S + O2 and Na
A. Na2SO4 and H2O
Predict what happens when nickel is added to a solution of potassium chloride. A. No reaction occurs B. Nickel chloride forms C. Potassium nickel chloride forms D. Hydrochloric acid forms
A. No reaction occurs
After the first steps in writing an equation, the equation is balanced by... A. adjusting coefficients to the smallest whole-number ratio B. adjusting subscripts to the formula(s) C. changing the products formed D. making the number of reactants equal to the number of products
A. adjusting coefficients to the smallest whole-number ratio
Predict what happens when lead is added to nitric acid. A. No reaction occurs B. Oxygen is released C. Lead oxide forms D. Hydrogen is released
D. Hydrogen is released
Magnesium bromide (aq) + chlorine (g) yields... A. Mg(s) and BrCl(aq) B. MgCl(aq) and Br2(l) C. MgBrCl(aq) D. MgCl2(aq) and Br2(l)
D. MgCl2(aq) and Br2(l)
Which of the following equations represents a double-displacement reaction? A. FeS(s) + 2HCl(aq) --> H2S(g) + FeCl2(aq) B. 2HgO(s) --> 2Hg(l) + O2(g) C. 2Sb(s) + 3I2(g) --> 2SbI(s) D. Zn(s) + H2SO4(aq) --> ZnSO4(aq) + H2(g)
A. FeS(s) + 2HCl(aq) --> H2S(g) + FeCl2(aq)
Predict what happens when zinc is added to water. A. No reaction occurs B. Steam is produced C. Zinc oxide forms D. Hydrogen is released
A. No reaction occurs
The reaction 2C2H2(g) + 5O2(g) --> 4CO2(g) + 2H2O(l) is... A. combustion reaction B. synthesis reaction C. decomposition reaction D. double-displacement reaction
A. combustion reaction
Which coefficients correctly balance the formula equation NH4NO2(s) N2(g) + H2O(l)? A. 1, 2, 2 B. 1, 1, 2 C. 2, 1, 1 D. 2, 2, 2
B. 1, 1, 2
What is the balanced equation when aluminum reacts with copper(II) sulfate? A. Al + Cu2S --> Al2S + Cu B. 2Al + 3CuSO4 --> Al2(SO4)3 + 3Cu C. Al + CuSO4 --> AlSO4 + Cu D. 2Al + Cu2SO4 --> Al2SO4 + 2Cu
B. 2Al + 3CuSO4 --> Al2(SO4)3 + 3Cu
Which of the following equations represents a decomposition reaction? A. 2Sb(s) + 3I2(g) --> 2SbI3(s) B. 2HgO(s) --> 2Hg(l) + O2(g) C. FeS(s) + 2HCl(aq) --> H2S(g) + FeCl2(aq) D. Zn(s) + H2SO4(aq) --> ZnSO4(aq) + H2(g)
B. 2HgO(s) --> 2Hg(l) + O2(g)
Predict what happens when calcium metal is added to a solution of magnesium chloride. A. No reaction occurs B. Calcium chloride forms C. Magnesium calcite forms D. Gaseous calcium is produced
B. Calcium chloride forms
Which word equation represents the reaction that produces water from hydrogen and oxygen? A. Water is produced from hydrogen and oxygen B. Hydrogen plus oxygen yields water C. H2 + O2 water D. Water can be separated into hydrogen and oxygen
B. Hydrogen plus oxygen yields water
How would oxygen be represented in the formula equation for the reaction of methane and oxygen to yield carbon dioxide and water? A. oxygen B. O C. O2 D. O3
B. O2
An element in the activity series can replace any element... A. in the periodic table B. below it on the list C. above it on the list D. in its group
B. below it on the list
The reaction of calcium oxide, CaO, with water yields... A. calcium and oxygen gas B. calcium hydroxide C. calcium and a salt D. carbon dioxide and water
B. calcium hydroxide
Which reaction can be predicted from the activity series? A. 2Cl(g) --> Cl2(g) B. HCl(aq) + NaOH(aq) --> NaCl(aq) + H2O(l) C. 2H2O(aq) + 2Na(s) --> 2NaOH(aq) + H2(g) D. Cl2(g) --> 2Cl(g)
C. 2H2O(aq) + 2Na(s) --> 2NaOH(aq) + H2(g)
In writing a chemical equation that produces hydrogen gas, the correct representation of hydrogen gas is... A. H B. 2H C. H2 D. OH
C. H2
Which of the following is not true regarding a properly written chemical equation? A. It must be balanced B. It must contain proper chemical formulas C. It must show the formation of a precipitate or a gas D. It should represent known data
C. It must show the formation of a precipitate or a gas
The complete balanced equation for the reaction between zinc hydroxide and acetic acid is... A. ZnOH + CH3COOH ZnCH3COO + H2O B. Zn(OH)2 + CH3COOH Zn + 2CO2 +3H2O C. Zn(OH)2 + 2CH3COOH Zn(CH3COO) 2 + 2H2O D. Zn(OH)2 + 2CH3COOH Zn(CH3COO)2 + H2 + O2
C. Zn(OH)2 + 2CH3COOH Zn(CH3COO) 2 + 2H2O
If metal X is lower than metal Y in the activity series, then metal X... A. replaces ions of metal Y in a solution B. loses electrons more readily than does metal Y C. loses electrons less readily than does metal Y D. forms positive ions more readily than does metal Y
C. loses electrons less readily than does metal Y
Magnesium hydroxide decomposes to yield magnesium oxide and... A. hydrogen B. oxygen C. water D. salt
C. water
Which coefficients correctly balance the formula equation CaO + H2O Ca(OH)2? A. 2, 1, 2 B. 1, 2, 3 C. 1, 2, 1 D. 1, 1, 1
D. 1, 1, 1
Which equation is not balanced? A. 2H2 + O2 --> 2H2O B. 4H2 + 2O2 --> 4H2O C. H2 + H2 + O2 --> H2O + H2O D. 2H2 + O2 --> H2O
D. 2H2 + O2 --> H2O
What is the small whole number that appears in front of a formula in a chemical equation? A. a subscript B. a superscript C. a ratio D. a coefficient
D. a coefficient
If chlorine gas is produced by halogen replacement, the other halogen in the reaction must be... A. bromine B. iodine C. astatine D. fluorine
D. fluorine
When sodium chlorate, NaClO3, decomposes, the products are... A. sodium hydroxide and water B. sodium oxide and chlorine C. sodium and chlorine oxide D. sodium chloride and oxygen
D. sodium chloride and oxygen
If zinc replaces iron, iron replaces lead, and zinc replaces lead in a chemical reaction, the order of activity from most active to least active is... A. lead, iron, zinc B. zinc, lead, iron C. iron, zinc, lead D. zinc, iron, lead
D. zinc, iron, lead